12875120180913054916.0ARTICLEOn co-amenability for groups and von Neumann algebras20032003Journal ArticlesWe first show that co-amenability does not pass to subgroups, answering a question asked by Eymard in 1972. We then address co-amenability for von Neumann algebras, describing notably how it relates to the former.Monod, Nicolas181579243578Popa, Sorin82-873Comptes Rendus Mathématiques de l'Académie des Sciences; La Société Royale du Canada25EGG252235U11822oai:infoscience.tind.io:128751articleSBEGG-ARTICLE-2008-003OTHERPUBLISHEDREVIEWEDARTICLE